"I enjoyed the attention, the feeling both of them gave me and the thought of a different life," Mitchell said in a statement in the documents.

Her lawyer, Stephen Johnston, said on Tuesday that his client realizes she made a "horrible mistake."

"She got in over her head into something that she never should have started," he said outside court. "But she did, and she's paying the price now.

"I think that to a certain extent, Matt got her to feeling good about herself, better than she had for a period of time, and she was swept off her feet a bit."

In the documents, Mitchell said she was alone with Matt in April when he kissed her. "It startled me," she said.

She admitted to performing sex acts on him "out of fear" and exchanging notes of a sexual nature with the men. She also told authorities she took naked photos of herself and gave them to Matt to pass on to Sweat, the documents show.

The two convicted killers escaped Clinton Correctional Facility on June 6 after Mitchell allegedly smuggled them weapons. She was supposed to be their getaway driver on the morning of the escape but checked herself into hospital with a panic attack instead.

On Tuesday, she leaded guilty to first-degree promoting prison contraband and fourth-degree criminal facilitation in court as she wiped away tears.

Matt was shot and killed by searchers on June 26. Sweat was captured near the Canadian border two days later and sent to another prison.

By accepting the plea deal on Tuesday, she waived her right to appeal and agreed to co-operate with the ongoing investigation on the breakout.